THOMAS R. CECH - SIGNATURE(S) - HFSID 277657

THOMAS CECH
The Nobel Prize-winning biochemist signs a 5x3 card.
Signature: "Thomas R. Cech", 5x3 card. Cech (b. 1947), an American
molecular biochemist was awarded the 1989 Nobel Prize for Chemistry for
discovering that RNA (ribonucleic acid), a type of nucleic acid involved in
heredity, can also act as an enzyme, aiding a chemical reaction without being
changed or consumed. Previously, scientists thought all enzymes were
proteins. Cech also found that RNA can duplicate itself, indicating that
it may have existed before another unit of heredity known as DNA
(deoxyribonucleic acid) and therefore could have been the key molecule in the
origin of life billions of years ago. Fine condition.

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